/*
 *                               POK header
 *
 * The following file is a part of the POK project. Any modification should
 * be made according to the POK licence. You CANNOT use this file or a part
 * of a file for your own project.
 *
 * For more information on the POK licence, please see our LICENCE FILE
 *
 * Please follow the coding guidelines described in doc/CODING_GUIDELINES
 *
 *                                      Copyright (c) 2007-2021 POK team
 */

/* crypto/des/des_enc.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#ifdef POK_NEEDS_PROTOCOLS_DES

#include "des_locl.h"
#include "spr.h"

void DES_encrypt1(DES_LONG *data, DES_key_schedule *ks, int enc) {
  register DES_LONG l, r, t, u;
#ifdef DES_PTR
  register const unsigned char *des_SP = (const unsigned char *)DES_SPtrans;
#endif
#ifndef DES_UNROLL
  register int i;
#endif
  register DES_LONG *s;

  r = data[0];
  l = data[1];

  IP(r, l);
  /* Things have been modified so that the initial rotate is
   * done outside the loop.  This required the
   * DES_SPtrans values in sp.h to be rotated 1 bit to the right.
   * One perl script later and things have a 5% speed up on a sparc2.
   * Thanks to Richard Outerbridge <71755.204@CompuServe.COM>
   * for pointing this out. */
  /* clear the top bits on machines with 8byte longs */
  /* shift left by 2 */
  r = ROTATE(r, 29) & 0xffffffffL;
  l = ROTATE(l, 29) & 0xffffffffL;

  s = ks->ks->deslong;
  /* I don't know if it is worth the effort of loop unrolling the
   * inner loop */
  if (enc) {
#ifdef DES_UNROLL
    D_ENCRYPT(l, r, 0);  /*  1 */
    D_ENCRYPT(r, l, 2);  /*  2 */
    D_ENCRYPT(l, r, 4);  /*  3 */
    D_ENCRYPT(r, l, 6);  /*  4 */
    D_ENCRYPT(l, r, 8);  /*  5 */
    D_ENCRYPT(r, l, 10); /*  6 */
    D_ENCRYPT(l, r, 12); /*  7 */
    D_ENCRYPT(r, l, 14); /*  8 */
    D_ENCRYPT(l, r, 16); /*  9 */
    D_ENCRYPT(r, l, 18); /*  10 */
    D_ENCRYPT(l, r, 20); /*  11 */
    D_ENCRYPT(r, l, 22); /*  12 */
    D_ENCRYPT(l, r, 24); /*  13 */
    D_ENCRYPT(r, l, 26); /*  14 */
    D_ENCRYPT(l, r, 28); /*  15 */
    D_ENCRYPT(r, l, 30); /*  16 */
#else
    for (i = 0; i < 32; i += 8) {
      D_ENCRYPT(l, r, i + 0); /*  1 */
      D_ENCRYPT(r, l, i + 2); /*  2 */
      D_ENCRYPT(l, r, i + 4); /*  3 */
      D_ENCRYPT(r, l, i + 6); /*  4 */
    }
#endif
  } else {
#ifdef DES_UNROLL
    D_ENCRYPT(l, r, 30); /* 16 */
    D_ENCRYPT(r, l, 28); /* 15 */
    D_ENCRYPT(l, r, 26); /* 14 */
    D_ENCRYPT(r, l, 24); /* 13 */
    D_ENCRYPT(l, r, 22); /* 12 */
    D_ENCRYPT(r, l, 20); /* 11 */
    D_ENCRYPT(l, r, 18); /* 10 */
    D_ENCRYPT(r, l, 16); /*  9 */
    D_ENCRYPT(l, r, 14); /*  8 */
    D_ENCRYPT(r, l, 12); /*  7 */
    D_ENCRYPT(l, r, 10); /*  6 */
    D_ENCRYPT(r, l, 8);  /*  5 */
    D_ENCRYPT(l, r, 6);  /*  4 */
    D_ENCRYPT(r, l, 4);  /*  3 */
    D_ENCRYPT(l, r, 2);  /*  2 */
    D_ENCRYPT(r, l, 0);  /*  1 */
#else
    for (i = 30; i > 0; i -= 8) {
      D_ENCRYPT(l, r, i - 0); /* 16 */
      D_ENCRYPT(r, l, i - 2); /* 15 */
      D_ENCRYPT(l, r, i - 4); /* 14 */
      D_ENCRYPT(r, l, i - 6); /* 13 */
    }
#endif
  }

  /* rotate and clear the top bits on machines with 8byte longs */
  l = ROTATE(l, 3) & 0xffffffffL;
  r = ROTATE(r, 3) & 0xffffffffL;

  FP(r, l);
  data[0] = l;
  data[1] = r;
  l = r = t = u = 0;
}

void DES_encrypt2(DES_LONG *data, DES_key_schedule *ks, int enc) {
  register DES_LONG l, r, t, u;
#ifdef DES_PTR
  register const unsigned char *des_SP = (const unsigned char *)DES_SPtrans;
#endif
#ifndef DES_UNROLL
  register int i;
#endif
  register DES_LONG *s;

  r = data[0];
  l = data[1];

  /* Things have been modified so that the initial rotate is
   * done outside the loop.  This required the
   * DES_SPtrans values in sp.h to be rotated 1 bit to the right.
   * One perl script later and things have a 5% speed up on a sparc2.
   * Thanks to Richard Outerbridge <71755.204@CompuServe.COM>
   * for pointing this out. */
  /* clear the top bits on machines with 8byte longs */
  r = ROTATE(r, 29) & 0xffffffffL;
  l = ROTATE(l, 29) & 0xffffffffL;

  s = ks->ks->deslong;
  /* I don't know if it is worth the effort of loop unrolling the
   * inner loop */
  if (enc) {
#ifdef DES_UNROLL
    D_ENCRYPT(l, r, 0);  /*  1 */
    D_ENCRYPT(r, l, 2);  /*  2 */
    D_ENCRYPT(l, r, 4);  /*  3 */
    D_ENCRYPT(r, l, 6);  /*  4 */
    D_ENCRYPT(l, r, 8);  /*  5 */
    D_ENCRYPT(r, l, 10); /*  6 */
    D_ENCRYPT(l, r, 12); /*  7 */
    D_ENCRYPT(r, l, 14); /*  8 */
    D_ENCRYPT(l, r, 16); /*  9 */
    D_ENCRYPT(r, l, 18); /*  10 */
    D_ENCRYPT(l, r, 20); /*  11 */
    D_ENCRYPT(r, l, 22); /*  12 */
    D_ENCRYPT(l, r, 24); /*  13 */
    D_ENCRYPT(r, l, 26); /*  14 */
    D_ENCRYPT(l, r, 28); /*  15 */
    D_ENCRYPT(r, l, 30); /*  16 */
#else
    for (i = 0; i < 32; i += 8) {
      D_ENCRYPT(l, r, i + 0); /*  1 */
      D_ENCRYPT(r, l, i + 2); /*  2 */
      D_ENCRYPT(l, r, i + 4); /*  3 */
      D_ENCRYPT(r, l, i + 6); /*  4 */
    }
#endif
  } else {
#ifdef DES_UNROLL
    D_ENCRYPT(l, r, 30); /* 16 */
    D_ENCRYPT(r, l, 28); /* 15 */
    D_ENCRYPT(l, r, 26); /* 14 */
    D_ENCRYPT(r, l, 24); /* 13 */
    D_ENCRYPT(l, r, 22); /* 12 */
    D_ENCRYPT(r, l, 20); /* 11 */
    D_ENCRYPT(l, r, 18); /* 10 */
    D_ENCRYPT(r, l, 16); /*  9 */
    D_ENCRYPT(l, r, 14); /*  8 */
    D_ENCRYPT(r, l, 12); /*  7 */
    D_ENCRYPT(l, r, 10); /*  6 */
    D_ENCRYPT(r, l, 8);  /*  5 */
    D_ENCRYPT(l, r, 6);  /*  4 */
    D_ENCRYPT(r, l, 4);  /*  3 */
    D_ENCRYPT(l, r, 2);  /*  2 */
    D_ENCRYPT(r, l, 0);  /*  1 */
#else
    for (i = 30; i > 0; i -= 8) {
      D_ENCRYPT(l, r, i - 0); /* 16 */
      D_ENCRYPT(r, l, i - 2); /* 15 */
      D_ENCRYPT(l, r, i - 4); /* 14 */
      D_ENCRYPT(r, l, i - 6); /* 13 */
    }
#endif
  }
  /* rotate and clear the top bits on machines with 8byte longs */
  data[0] = ROTATE(l, 3) & 0xffffffffL;
  data[1] = ROTATE(r, 3) & 0xffffffffL;
  l = r = t = u = 0;
}

void DES_encrypt3(DES_LONG *data, DES_key_schedule *ks1, DES_key_schedule *ks2,
                  DES_key_schedule *ks3) {
  register DES_LONG l, r;

  l = data[0];
  r = data[1];
  IP(l, r);
  data[0] = l;
  data[1] = r;
  DES_encrypt2((DES_LONG *)data, ks1, DES_ENCRYPT);
  DES_encrypt2((DES_LONG *)data, ks2, DES_DECRYPT);
  DES_encrypt2((DES_LONG *)data, ks3, DES_ENCRYPT);
  l = data[0];
  r = data[1];
  FP(r, l);
  data[0] = l;
  data[1] = r;
}

void DES_decrypt3(DES_LONG *data, DES_key_schedule *ks1, DES_key_schedule *ks2,
                  DES_key_schedule *ks3) {
  register DES_LONG l, r;

  l = data[0];
  r = data[1];
  IP(l, r);
  data[0] = l;
  data[1] = r;
  DES_encrypt2((DES_LONG *)data, ks3, DES_DECRYPT);
  DES_encrypt2((DES_LONG *)data, ks2, DES_ENCRYPT);
  DES_encrypt2((DES_LONG *)data, ks1, DES_DECRYPT);
  l = data[0];
  r = data[1];
  FP(r, l);
  data[0] = l;
  data[1] = r;
}

#ifndef DES_DEFAULT_OPTIONS

#if !defined(OPENSSL_FIPS_DES_ASM)

#undef CBC_ENC_C__DONT_UPDATE_IV
#include "ncbc_enc.c" /* DES_ncbc_encrypt */

void DES_ede3_cbc_encrypt(const unsigned char *input, unsigned char *output,
                          long length, DES_key_schedule *ks1,
                          DES_key_schedule *ks2, DES_key_schedule *ks3,
                          DES_cblock *ivec, int enc) {
  register DES_LONG tin0, tin1;
  register DES_LONG tout0, tout1, xor0, xor1;
  register const unsigned char *in;
  unsigned char *out;
  register long l = length;
  DES_LONG tin[2];
  unsigned char *iv;

  in = input;
  out = output;
  iv = &(*ivec)[0];

  if (enc) {
    c2l(iv, tout0);
    c2l(iv, tout1);
    for (l -= 8; l >= 0; l -= 8) {
      c2l(in, tin0);
      c2l(in, tin1);
      tin0 ^= tout0;
      tin1 ^= tout1;

      tin[0] = tin0;
      tin[1] = tin1;
      DES_encrypt3((DES_LONG *)tin, ks1, ks2, ks3);
      tout0 = tin[0];
      tout1 = tin[1];

      l2c(tout0, out);
      l2c(tout1, out);
    }
    if (l != -8) {
      c2ln(in, tin0, tin1, l + 8);
      tin0 ^= tout0;
      tin1 ^= tout1;

      tin[0] = tin0;
      tin[1] = tin1;
      DES_encrypt3((DES_LONG *)tin, ks1, ks2, ks3);
      tout0 = tin[0];
      tout1 = tin[1];

      l2c(tout0, out);
      l2c(tout1, out);
    }
    iv = &(*ivec)[0];
    l2c(tout0, iv);
    l2c(tout1, iv);
  } else {
    register DES_LONG t0, t1;

    c2l(iv, xor0);
    c2l(iv, xor1);
    for (l -= 8; l >= 0; l -= 8) {
      c2l(in, tin0);
      c2l(in, tin1);

      t0 = tin0;
      t1 = tin1;

      tin[0] = tin0;
      tin[1] = tin1;
      DES_decrypt3((DES_LONG *)tin, ks1, ks2, ks3);
      tout0 = tin[0];
      tout1 = tin[1];

      tout0 ^= xor0;
      tout1 ^= xor1;
      l2c(tout0, out);
      l2c(tout1, out);
      xor0 = t0;
      xor1 = t1;
    }
    if (l != -8) {
      c2l(in, tin0);
      c2l(in, tin1);

      t0 = tin0;
      t1 = tin1;

      tin[0] = tin0;
      tin[1] = tin1;
      DES_decrypt3((DES_LONG *)tin, ks1, ks2, ks3);
      tout0 = tin[0];
      tout1 = tin[1];

      tout0 ^= xor0;
      tout1 ^= xor1;
      l2cn(tout0, tout1, out, l + 8);
      xor0 = t0;
      xor1 = t1;
    }

    iv = &(*ivec)[0];
    l2c(xor0, iv);
    l2c(xor1, iv);
  }
  tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
  tin[0] = tin[1] = 0;
}

#endif

#endif /* DES_DEFAULT_OPTIONS */

#endif /* POK_NEEDS ... */
